Question

question 6
why do leaves change color in the fall?
a as days get shorter the plants break down the chlorophyll pigments and the other colors are now visible.
b as days get shorter plants stop the production of chlorophyll and start the production of other pigments for protection.
c both answers are correct
question 7
your paper strip may have shown some banding of colors. i want you to critically think about the colors that may be on the strip. if you did not have multiple colors, use the photograph at the end of the lab as your strip for these questions. explain why the colors are ordered the way they are?
a the carotene and xanthophylls are the heavest so they are at the top of the paper.
b the carotene pigment is the smallest and it traveled the farthest up the paper and chlorophyll b is the largest which did not travel that far.
c chlorophyll a and b did not disolve in the acetone therefore did not move at all.
d water would have been a beter solvent to use in this lab

Explanation:

For Question 6, as days shorten in fall, plants break - down chlorophyll. Chlorophyll gives leaves their green color, and when it breaks down, other pigments like carotenoids and anthocyanins become visible. This matches option A. Also, plants may stop chlorophyll production and produce other protective pigments, which is option B. So both are correct.
For Question 7, in paper chromatography of plant pigments, smaller and more non - polar pigments like carotene travel farther up the paper, while larger and more polar pigments like chlorophyll b do not travel as far. Option B correctly describes this principle.

Answer:

Question 6: C. both answers are correct
Question 7: B. The carotene pigment is the smallest and it traveled the farthest up the paper and chlorophyll b is the largest which did not travel that far.